<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>h1.html</title>
  <style>
    div {
      border: 1px solid #ff00ff;
    }
  </style>
  <link rel="stylesheet" href="css/h1.css">
</head>

<body>
  第一个网页
  <div class="abc" style="color: red;background-color: #00ffff;">
    一些东西
  </div>
</body>

</html>